Experimental study on velocity fluctuations of suspended particles

The image processing technique was applied to measure velocity fluctuations of suspended particles in open channel flows. Two kinds of spherical particles were studied: plastic particles (d=0.1～1.5 mm) and glass particles (d=0.1～0.3 mm). Experimental results reveal that: (1) coarse particles possess greater velocity fluctuations than fine particles in the near bed region, while the scenario is completely opposite in the upper flow; (2) the velocity fluctuation of fine particles is a function of y/h, and for coarse particles, the velocity fluctuations relate not only to y/h but also to the shear stress;and (3) the plastic particles have greater velocity fluctuations than glass particles of the same size.

XIAO Yanga,b,c,HUANG Zhen-pingb,TANG Li-moa,b,c,AYIDENb(Hohai University a.State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering; b.College of Water Conservancy and Hydropower Engineering;c.National Engineering Research Center of Water Resources Efficientutilization and Engineering Safety,Nanjing 210098,China);Experiments on Velocity of Sediment Movement in Steady Flow[J];South-to-North Water Diversion and Water Science & Technology;2012-02